Hey gang,

Is there any reason why someone should replace O2 sensors if they aren't throwing an error code?

My 2000 and 04 are all running the originals, and I'm about to make a RoverParts order, and want to get everything I need.

Thanks!

Pat

 

Technically if they are old they MAY have drifted a bit and your motor could be running leaner than it ideally would be or richer but not really by much either way. If the sensor drifts out of statiometric(spelling?) range it'll throw a code. Being they are $79-140 a piece I would run what ya brung. If you're just really **** you could pull one spark plug from each bank and make sure niether are sooty or black. They should be fairly clean or ashy. If one is sooty or black you might want to change that banks front o2 sensor. No one cares about the emissions o2 sensors after the cats. The front two on both sides are for the engine to gauage statiometric (14.7:1) air/fuel conditions.

 

PERFECT information... thanks so much.

I'm running with what I'm brunging!

 

Looking at the mileage on both of your trucks, I'd say you've likely got another 5-20,000 miles in your o2's. They generally wear out in the 70-100,000 mile range. As long as you're getting the same gas mileage, I'd echo Garovee and say hang on to the ones you have until mileage starts to suffer.

 

That was actually what spurred the post: Ever since I've had my new block installed, I feel like I'm burning gas a little more quickly.

BUT- It's running darn good, so I think I'll hold off.

Thanks guys.